Not for IF. If I was doing IF I would stick to it “one day won’t kill you” mentality is fine from person saying perspective but if 20 people say that then one day becomes 20 day in no time.
If it’s birthday or some special occasion like charismas yeah fasting goes out of a window. But random “lets go for breakfast” is a now. I am happy to go for breakfast eat what you want my friend I will have a coffee, it shouldn’t stop you from eating.
So yes I will sit with family in the evening on my Alternate Fasting Day and they will have tea and biscuits and I will only have tea I have no problem with that.
I believe there is some benefit to having a day of normal eating to keep your metabolism on its toes as it were. Pretty sure I came across this through a Tim Ferriss podcast or on this Andrew Huberman one - https://www.youtube.com/watch?v=9tRohh0gErM.
See what works out for you. I don’t necessarily fast for weight loss but more for cognitive benefits and I find shaking it up once or even twice a week works well while avoiding the urge to go back to the usual 3 meals/day full time.